Improvement in telegraphic indicators



2 Sheets Sheet l.

Patented March 31, 1868.

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2 Sheets Sheet 2.

E. A. CAL'J'HAN. Telegraphic ndieator.

Patented March 3l, 1868.

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newline A. GALAHAN, or BnooKLYN.,NEW YORK.

Letters Patent Ifo. 70.157, dated March 31, 1868; anteclated'lifarch 23,1868.

IMPROVEMENT IN TELEGRAPHIG INDICATORS.

TO ALL WHOM IT MAY CONCEItN c Bc it known that I, EDWARD A. CALAHAN, ofBrooklyn, inthe county of Kings, and Stateot' New York, have invented,made,.an l applied to use, a certain new and useful Improvement 1nTelegrapbic Indicators for the prices of gold, stocks', Snc.; and I dohereby declare the following to be a. full, clear, and exact descriptionof. the said invention, reference being had to the annexed drawing,making part of this specification, wherein- Figure I is a plan of thesaid indicator, the box enclosing the dia-l and cloek-work being insection.

Figure 2 is an elevation of the transmitting portion of the instrument,showing also the receiving-box and exposed figure of the dial; and VFigure 3 is-an elevation of `the magnet and escapement.

Similar marks of' reference denote thesame parts.

In'mostcommercial cities a want has been experienced of a cheap andrcliablevindicator for tclegraphing, from the centres of trade to'distant businessvrms and operators, the fluctuations in the prices ofgold, stocks, articles of merchandise, tbc. Several edorts 'have beenmade to meet this want. but the machines have been costly, difiieult tomanage, or liable to get 'out of repair.

The nature of my said invention consists in a transmitting-instrument,formed as a. disk. upon which' are marked the signals, numbers, or wordsto be pointed out. Over this is an armthat makes and breaks theircuit bycontact with the undulating edge of a metallic ring,` and I form thercceivinginstrumeut of a. dial; corresponding to the transmitting-disk,actuated by clock-work, controlled by a. peculiar'let-oi mechanismworked by the magnet, so that the receiving-dial or dials in atclegraphic circuit are all brought to the sam indicatingpoint by thepulsations of electric-ity from one of the transmitting-instruments.

In the drawing, a isa table, b and c the positive and negativebinding-screws; dis a. dial, around which are a. wooden flange, 2, andv. metal ring, 3, thc upper edge of which is undulating, and the highestpoints rise above and the lowest points pass'below the surfaceof theange 2. The number of u'ndulationsi corresponds with the number ofsigns, numbers,figurcs, or names placed around tho dial d, and the sameare placed on the line ofthe pointer e \vhen resting on the wood ornon-conducting [lange 2, between but not in contact with the projectingundulations. The pointere is moved by the wheelfand pinion on the axisof the cranky, and this is supported by the bracket h. The binding-screwb connects with the centre of the arm or pointer e, and the screw cconnects with the ring 3 through the magnct-coil r.

It will now be understood vthat the 'movement of the pointer e from onepoint of the dial to another` will causo as many pulsationsofelectricity as there are projecting undulations of the ring'3 that aretravelled over by the pointer, and that the armature z' ofthereceiving-magnets r will receive the same number of vibrations.

I provide a receiving-dial, l, within a case, m, in which is an opening,through which can be seen one of the signs, figures; letters, or nameson thedial l; and'thc'divisions, positionsof names and numbers on thedial l, correspond to'those on'u the dial of thetransmitting-instrument. The dial lis on one of the shafts of aclockmovement w, actuated by a spring or weight, and o is thecscapement-shaft, the trains of Wheels being lso p'roA portioned thatone revolir ion of the shafto isgven each change of the'dial from onedivision to the next; hence I make my peculiar escapement, so that,every pulsation of the magnet, the shaftio shall be allowed to revolveonce, and cannot turn anymore than one revolution; hence thetransmitting and receiving-instruments will remain in unison, regardlessof the speed of transmission or operations of the parts.

Upon the end of the shafto is the es'capement-arin 4,'that operatesagainst the pallets and 6 of the escapee ment. The lover 7 of thcarmature operates on this escapement in one diriction, and the spring8in the other direction, and 9 is a counterbalance. to the arm 4, butshorter.

In the normal position ofthe escapement the parts are in the positionshown in fig. 3, with the arm 4 against the pallet 6, but when thatvismoved by the magnet (incited by the elcctrlcity) the pallet 6 draws backand the arm 4 flics around,-strikes the pallet 5, and holds theclock-movement and disk l until the'circut is'broken and tile magnetismno longer is operative, and the pallet 5 is releascdLthe arm being againarrested by the pallet 6. In this last position the receiving andtransmitting-instruments indicate corresponding numbers, signs, orwords.

It will be evident that the operation of this machine will be veryrapid, and that there is no'tbing liable to dcrangement or' injury Twodials may be employed, one with figures, the other with names, signsJorfractions, or the fractions and names may be so placed on the dials asto be indicated when the circuit is closed. Y

What I claim, and desire to secure by Letters Patent, is 1. Thetransmitting-instrumcnt, formed of a disk, in combination with the arm eand undulatin` odge of the metallic ring, the parts being connected andoperating as and for the purposes set forth.

2. The escapement and arm, constructed as specified, in combination withthe armature, magnet, clockwork, and dial, as and for thc purposesspecified.

In witness whereof, I have hereunto set my signature, this thirtieth dayof July, A. D.1867.

EDW'D CALAHAN.

Witnesses Crus. H. SMITH, Gm. D. WALKER.

